Dutch artist Berndnaut Smilde discovered a way to create clouds in the middle of a room by carefully balancing temperature, humidity and lighting. In fact, he regularly uses those clouds in his artwork.
To create the clouds, the space must be damp, cold and with no air circulation. Smilde creates a wall of water vapor and, by using a smoke machine, he sends a puff of artificial fog on a collision course. For just one shoot, he might create more than 100 clouds!
Here are some pictures of his indeed stunning artwork: (the article continues after the ad)
Check out how he does it in a video by Deutsche Welle: